Composition for rendering cardboard impervious to grease



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COATING OR PLASTIC.

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1; xaminer I I u I wn' M GtvceRW V D n UNITED STATES FATE pf rfilcs.

ANDREW J. CAVANAUGH, JR, OF RICHMOND, VIRGINIA, ASSIGNOR TO THE RAN- DOLPH PAPER BOX COMPANY, OF RICHMOND, VIRGINIA, A CORPORATION OF VIRGINIA.

COMPOSITION FOR BENDERING CARDBOARD IMPEBVIOUS TO GREASE.

No Drawing.

T 0 all whom it may concern:

Be it known that I, ANDREW J. CAVA- NAUGH, Jr., a citizen of the United States, residing at Richmond, in the county of Henrico and State of Virginia, have invented certain new and useful Improvements in Composition for Rendering Cardboard Impervious to Grease; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to paper and particularly relates to a composition for application to paper or fibrous material whereby it is rendered substantially impervious to grease, oils, and the like and especially has for its object the preparation of a paste or smiplastic material which may be brushed on to the surface of the paper or fibrous material of whatever its nature which it is desired to treat so as to render it impervious to grease, it being understood that the paste may be applied in any suitable manner as well as by brushing to the surface of the paper, etc., either before or after the paper is shaped into any article of manufacture.

And the invention consists in a combination of ingredients as more particularly set forth hereinafter, and also consists in the method of compounding the paste.

A practical and eflicacious composition of the desired nature may be readily made by the mixture of suitable proportions of sodium silicate. mica. 'lv crin. and powcrcr i OTIUID, and 11 some instances. if preerrec iere may be added prepared ch lk. which latter is utilized to thicken the pas e to bring it to the desired consistency although this may be eliminated when the paste or cement is preferred to be in a thin in the practice of the method of making the paste, a suitable quantity of sodium silicate say eleven pounds is mixed WltE about a quarter of a pound of mica and ten ounces Specification of Letters Patent.

Patented Nov. 2, 1920.

Application filed January 5, 1918. Serial No. 210,459.

trin which has the property of acting as an ai'lh esive to render a composition more or less densely consistent and also facilitates the drying of the paste.

The several ingredients are preferably mixed in the presence of heated water to facilitate the thorough intermi'xmf the components. and is then ready to be used by the application L 1 the brush or other me 10d. to the surimother fibrous bod vEd11c.,';fj. t:is desired to render limitrass.

For the purpose of increasing the thickness or consistency of the preparation, there may be added a quantity of prepgfd chalk in the proportion of two ounces 0 1e quantities above given for the other ingredients, it being understood however that the proper consistency of the paste may he arrived at by relative variation of the other ingredients, and in their mixture with a greater or larger quantity of water. From the above it will be seen that I have provided a composition of this character, formed of ingredients, all of which are relatively inexpensive. and which form a composition capable of giving to the paper or other fibrous material to be coated, the desired characteristic of being substantially impervious to grease.

hat is claimed is:

1. A paste for application to paper or e-other fibrous material, whereby it is rendered impervious to grease, and consisting of a mixture of sodium silicate, mica, powdered dextrin, glycerin and a thickener.

2. A material for rendering paper or other fibrous material substantially grease .proof, which consists of a mixture in paste form, consisting of eleven pounds of sodium silicate, of a pound of mica, ten ounces of glycerin, and three ounces of powdered dextrin, and prepared chalk in a suflicient quantity to thicken the material.

In testimony whereof I affix my signature.

ANDREW J. CAVANAUGH, JR.

To this mixture there may then 55 

